Income Tax - Additional Information (Detail) - TWD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Disclosure Of Income Taxes [line items] | |||
| Aggregate deductible temporary differences for which no deferred income tax assets recognized | $ 52,686.2 | $ 26,790.9 | |
| Aggregate taxable temporary differences associated with investments in subsidiaries not recognized as deferred income tax liabilities | $ 254,182.9 | $ 222,682.6 | |
| Changes in tax rates or tax laws enacted or announced [member] | |||
| Disclosure Of Income Taxes [line items] | |||
| Percentage of corporate income tax rate | 20.00% | 20.00% | 20.00% |